Abstract: A method of joining together two metal parts, one of which may be a tubular heater, wherein an insert such as a helical wire coil which is preferably provided with a core is positioned between the parts or around one of the parts and the parts pressed together into abutting engagement so that the insert is embedded in both of the parts to retain the parts together in a securely bonded relationship.

Abstract: Mounting arrangement for insertion of tubes into tube plate apertures of the walls of large heat exchangers, especially in wide condensers and in large power plant coolers, comprising a cross slide device fitted with a thrust means, guiding channels aligned with apertures and a roller arrangement which are adapted to advance the tubes mounted by the apparatus.

Abstract: Method and apparatus for blow molding double-walled containers from thermoplastic polymers in which the inner and outer container parts are simultaneously molded in a single tandem mold in the same molding cycle to produce special single-piece molded container intermediates. The intermediate is then cut apart along specially provided cut lines to provide a continuous inner container and a multipiece outer container in which the inner container nests. Loose, molded or batt-type insulation may be employed in annular space between the outer shell and the inner container. The outer container parts, bottom and top, are designed to snap-fit together. A carrying or pouring handle may optionally be molded into the outer shell part, or spout to the inner, or they may be added as separate pieces.

Abstract: A microwave oven having a door formed from metal structural elements which are welded together and coated with a nonconductive coating. Solid dielectric portions of the microwave seal choke are inserted into the choke regions of the door seal, and slotted portions of one of the steel structural elements are then deformed to form the choke and to lock the solid dielectric portions in place.

Abstract: A construction process for lifting, assembling and positioning multiple rows of collector electrodes and discharge electrodes in electrostatic precipitators. A mobile crane device is also disclosed which facilitates carrying out the process.

Abstract: Method and apparatus are described for automatically loading film transparencies into pre-closed slide mounts either of plastic or of cardboard material and having an internal pocket for receiving the film transparency which is inserted through an openable region near one edge of the mount. In loading operation, wedge means temporarily spread the openable portion of the slide mount, defining a passageway for the film transparency to pass through into the mount, and then the two sides of the mount are allowed to spring back to their closed position after loading. Advantageously, the film transparency is cut off from the filmstrip before loading, with the freshly cut end of the strip serving as pushing means for pushing the film transparency into its mount, and thus low inertial forces are involved, because the individual cut transparency has only a small mass to be accelerated and moved.

Abstract: A carrier structure for electronic components which allows safe handling, testing, marking and shipment is fabricated as an integral part of the electronic component package. The carrier forms a square protective enclosure surrounding the electronic device and connected to the electronic device by breakable plastic tabs which are molded with the electronics component package. The structure allows the electrical leads of the electronic component to be trimmed, formed, and tested while the component is still attached to the carrier.

Abstract: A high-temperature parallel-resistance pipe heater is described which is capable of being maintained at a high temperature level of approximately 600.degree. F on a sustained basis and is capable of withstanding temporary occasional heating up to 1,000.degree. F. A twisted pair of flexible electrical conductors with micaceous and fiberglass braid insulation layers have short segments stripped bare on alternate conductors at uniformly spaced intervals along their length, the conductors each including multiple fine nickel-clad copper strands, and a nickel-alloy resistance wire is helically wound around the twisted pair with two bights of the resistance wire engaging many of the strands in each bared segment for establishing numerous points of high unit area pressure contact at the junction between conductor and resistance wire. An anti-fraying agent on the fiberglass braid prevents the fibers from interfering with these points of contact.

Abstract: A method for making a plug-in fuse assembly comprises the steps of providing a blank of fuse metal which is initially provided between opposite margins thereof with a continuous portion of reduced thickness, blanking the blank of fuse metal to form a pair of generally parallel laterally spaced confronting terminal blade portions which are interconnected by a transverse web, current carrying extensions of the terminal blade portions and an interconnecting fuse link portion formed by remaining sections of said portion of reduced thickness, inserting and anchoring an insulating body between said current carrying extensions of the blank with the pair of terminal blade portions of the blank, which are interconnected by the transverse web, extending outwardly from the insulating lid, and blanking the exposed transverse web interconnecting the terminal blade portions.

Abstract: A method for making plug-in fuse elements of different desired fuse ratings comprising the steps of providing a blank of fuse metal which is initially provided throughout its length with a continuous portion of reduced thickness having a fixed thickness dimension for making fuses of a variety of fuse ratings, and blanking the blank of fuse metal to contain a pair of laterally spaced terminal blade portions, current carrying extensions thereof and an interconnecting fuse link portion of reduced thickness having a fixed thickness dimension located in a platelike body of a plug-in fuse element. The interconnecting fuse link portions of fixed reduced thickness dimension, provided by the blanking of the blanks of fuse metal are arranged in desired locations and desired configurations including width and length dimensions, to provide the different desired fuse ratings.

Abstract: A mechanism for sequentially feeding pins includes a collet having a longitudinal bore for feeding pins from one end to a second end, the second end holding the pins in position. The second end of the collet has at least one longitudinal slot contained therein, providing variations in the cross sectional area of the bore when the holding end of the collet is tightened around a pin. Pins are pushed through the center bore of the collet from a bottom feed point. Pins are positioned in an indexable disc having cutouts for containing the pins and delivering the pins one-by-one to the feed end of the collet bore. The disc cutouts are sequentially indexed by a ratchet and pawl mechanism. The collet can also be used to hold a pin for insertion into a hole in a printed circuit board and fastening of the pin to the printed circuit board by rolling over a portion of the pin with a punch, the punch being positioned coaxially with the collet bore.

Abstract: An electric heating element assembly includes a solderless fitting for sealably securing a sheathed heating element through an aperture in a container wall or bulkhead, such as in a dishwasher or the like. The fitting includes a cylindrical sleeve positioned over the sheath of the heating element and through the aperture. A radial flange on the fitting is drawn tight against a gasket and the wall by means of a fastener on the outside surface of the sleeve to secure a watertight seal between the fitting and the wall. The sleeve is attached to the sheath by means of an annular lip on the face of the flange, circumferential portions of this lip being axially compressed during assembly so as to radially-inwardly deform corresponding circumferential portions of the sleeve and the sheath to obtain a rotationally-locked liquid-sealing engagement therebetween.

Abstract: A method and apparatus for making plug-in fuse assemblies utilizing a strip of fuse metal having longitudinally spaced blank portions from which individual plug-in fuse elements are to be formed, each blank portion having corresponding portions spaced transversely of the length of the strip from which said fuse link portions, on the one hand, and at least said terminal blade portions, on the other hand, of a plug-in fuse element is to be formed. The strip of fuse metal is advanced past punch and die assemblies which form in each blank portion of the strip a pair of parallel confronting terminal blade portions and current-carrying extensions interconnected by a fuse link portion.

Abstract: The resistance material of a thick-film resistor is applied to a substrate in a layer having a configuration that tapers in a direction transverse to the direction of flow of current and the conductive leads are provided in contact with the tapering edges of the layer. A small incision on the shorter side of the layer between the tapering edges to which the leads are applied will have a relatively large effect on the resistance value without great effect on the amount of the area that determines the power rating of the resistor, so that trimmming by such an incision can be done quickly and the resistance change with progressive incision is more uniform than in the case of a resistor layer of rectangular configuration.

Abstract: A method for fabricating a multi-layer laminated charge plate for an ink jet printer. The charge plate is produced by selectively etched layers of photosensitive glass. By exposure of the photosensitive glass and controlled etching, the intermediate layers are provided with slots partially or completely etched through the thickness of the layers for the conductors to connect a charge electrode hole with pin connector pads. A heat treating process is used to bond the various layers of different thickness and configuration together by self-diffusion bonding. Metallization of the conductor paths is carried out with suitable alloys. The alloys with melting points higher than the bonding temperature can be deposited on appropriate layers prior to laminating. An alternate approach is to laminate the charge plate and produce metallization of the conductor path with a low melting point conductor by capillary flow.

Abstract: This relates to the scribing and breaking of a semiconductor wafer into individual dies by anodizing the silicon in regions corresponding to the die boundaries. The regions are selectively anodized, and the anodization is continued until the anodized silicon extends into the semiconductor wafer to a depth that allows easy breakage when the wafer is stressed. To facilitate breakage, the anodized silicon may be removed with hydrofluoric acid.

Abstract: An improved tool is provided for the removal of tubes from heat exchangers. First a mandrel is threaded into the end of a tube. The present tool is then fitted over the mandrel and is responsive to trigger-actuated hydraulic and/or pneumatic control means to automatically cause the tool to grip the mandrel and thereafter move the mandrel with its attached tube away from the tube sheet of the heat exchanger.

Abstract: Apparatus and method for gear tooth alignment by strain in order to minimize unbalanced loading of the gear teeth of a two stage parallel or branched gear system. Two hardened and separately ground gears are fitted with an easy fit between the shaft of one gear and the bore of the other and welded to make a compact cluster. The welded area develops a weakness resulting from being annealed due to heating in the welded zone. After assembling, the output shaft is locked to the gear train structure, the input gear is loaded slightly greater than the designed maximum load, causing the stress to exceed the yield point at the annealed welded area. A permanent deformation of all gears results with work hardening of the welded area during one cycle and a desired permanent repositioning of the teeth occurs resulting in reorientation of the gear teeth of the gears in mesh in the cluster.

Abstract: An apparatus is disclosed for the manufacture of a continuous heat exchanger tube including helically winding a spine fin material on the outer wall of a base tube member. A preselected portion of the spine fin material is secured against movement relative to the base tube member. The heat exchanger is then severed in the secured portion so that a section of the secured portion is arranged at each end of the severed heat exchanger. The secured severed end sections are effective in maintaining the intermediate portion of the spine fin material from unwinding and, as a result, in heat transfer relationship with the base tube member.

Abstract: A liquid crystal display assembly including a plurality of individual liquid crystal displays formed on a pair of cooperating substrates with the displays isolated from one another by a sealing pattern served to define individual displays. One method of forming a plurality of liquid crystal displays includes the steps of applying a conductive pattern to one surface each of a pair of substrates, the pattern cooperating when the substrates are face to face to form the plurality of displays, providing sealing means on at least one of the surfaces prior to bringing said surfaces together and in a pattern isolating each of the plurality of displays to form a plurality of displays cells, filling the cells with liquid crystal material, sealing the cells by bringing the substrates together and cutting substrates to form the displays.